Photoluminescence properties and energy transfer in a novel Sr 8 ZnY(PO 4 ) 7 :Tb 3+ ,Eu 3+ phosphor with high thermal stability and its great potential for application in warm white light emitting diodes

Mao Xia, Xianbo Wu, Yuan Zhong, H. T. Bert Hintzen, Zhi Zhou, Jing Wang

Research output: Contribution to journalArticleScientificpeer-review

49 Citations (Scopus)

Abstract

Terbium and europium co-doped Sr 8 ZnY(PO 4 ) 7 phosphors are successfully prepared through a high temperature solid-state reaction (SSR). The crystal structure of the as-prepared samples was identified to be Sr 8 ZnY(PO 4 ) 7 (SZYP) pure phase by an X-ray powder diffraction technique. Under near-ultraviolet light excitation (378 nm), the SZYP:Tb 3+ and SZYP:Eu 3+ phosphors show green and red emission peaking at 545 and 618 nm, respectively. Moreover, an effective energy transfer process from Tb 3+ to Eu 3+ could be verified by the concentration dependence of emission intensity and lifetime. The energy transfer mechanism between Tb 3+ and Eu 3+ is determined to be governed by dipole-dipole interactions. The internal quantum efficiency (IQE) is evaluated to be as high as about 91%. The temperature-dependent spectra indicate that the SZYP:Tb 3+ ,Eu 3+ phosphor shows a high thermal stability. Furthermore, the as-fabricated white LED devices exhibit an excellent correlated color temperature (CCT) of 3223 K, a color rendering index (R a ) of 85.8 and a luminance efficiency of 37.4 lm W -1 . All results imply that the SZYP:Tb 3+ ,Eu 3+ phosphors have a great potential for application in white LEDs.

Original languageEnglish
Pages (from-to)2927-2935
Number of pages9
JournalJournal of Materials Chemistry C
Volume7
Issue number10
DOIs
Publication statusPublished - 1 Jan 2019

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